Removed old grill vent 1st & then removed Phillips screws from top 2 holes. Inserted bottom edge of vent cover 1st in location holes & then moved the top into place and inserted and tightened 2 screws. I had to gently knock the top edge into place to fit snug.

I removed the two Phillips head screws at the top of the grill and removed the broken brackets where the grill attaches to the microwave. If some cleaning is required, it can best be done at this point. I pushed the new grill in place which required some light force and use of a thin knife to guide the new grill into the opening. The two Phillips head screws were then installed at the top of the grill to secure it in place. Very simple task.